# Copyright 2013 Rackspace, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from ironic_python_agent import encoding


class RESTError(Exception, encoding.Serializable):
    """Base class for errors generated in ironic-python-client."""
    # NOTE(JoshNang) `message` should not end with a period
    message = 'An error occurred'
    details = 'An unexpected error occurred. Please try back later.'
    status_code = 500
    serializable_fields = ('type', 'code', 'message', 'details')

    def __init__(self, details=None, *args, **kwargs):
        super(RESTError, self).__init__(*args, **kwargs)
        self.type = self.__class__.__name__
        self.code = self.status_code
        if details:
            self.details = details

    def __str__(self):
        return "{}: {}".format(self.message, self.details)

    def __repr__(self):
        """Should look like RESTError('message: details')"""
        return "{}('{}')".format(self.__class__.__name__, self.__str__())


class InvalidContentError(RESTError):
    """Error which occurs when a user supplies invalid content.

    Either because that content cannot be parsed according to the advertised
    `Content-Type`, or due to a content validation error.
    """
    message = 'Invalid request body'
    status_code = 400

    def __init__(self, details):
        super(InvalidContentError, self).__init__(details)


class NotFound(RESTError):
    """Error which occurs if a non-existent API endpoint is called."""
    message = 'Not found'
    status_code = 404
    details = 'The requested URL was not found.'


class CommandExecutionError(RESTError):
    """Error raised when a command fails to execute."""

    message = 'Command execution failed'

    def __init__(self, details):
        super(CommandExecutionError, self).__init__(details)


class InvalidCommandError(InvalidContentError):
    """Error which is raised when an unknown command is issued."""

    message = 'Invalid command'

    def __init__(self, details):
        super(InvalidCommandError, self).__init__(details)


class InvalidCommandParamsError(InvalidContentError):
    """Error which is raised when command parameters are invalid."""

    message = 'Invalid command parameters'

    def __init__(self, details):
        super(InvalidCommandParamsError, self).__init__(details)


class RequestedObjectNotFoundError(NotFound):
    def __init__(self, type_descr, obj_id):
        details = '{} with id {} not found.'.format(type_descr, obj_id)
        super(RequestedObjectNotFoundError, self).__init__(details)


class AgentIsBusy(CommandExecutionError):

    message = 'Agent is busy'
    status_code = 409

    def __init__(self, command_name):
        super().__init__('executing command %s' % command_name)


class IronicAPIError(RESTError):
    """Error raised when a call to the agent API fails."""

    message = 'Error in call to ironic-api'

    def __init__(self, details):
        super(IronicAPIError, self).__init__(details)


class HeartbeatError(IronicAPIError):
    """Error raised when a heartbeat to the agent API fails."""

    message = 'Error heartbeating to agent API'

    def __init__(self, details):
        super(HeartbeatError, self).__init__(details)


class HeartbeatConflictError(IronicAPIError):
    """ConflictError raised when a heartbeat to the agent API fails."""

    message = 'ConflictError heartbeating to agent API'

    def __init__(self, details):
        super(HeartbeatConflictError, self).__init__(details)


class LookupNodeError(IronicAPIError):
    """Error raised when the node lookup to the Ironic API fails."""

    message = 'Error getting configuration from Ironic'

    def __init__(self, details):
        super(LookupNodeError, self).__init__(details)


class LookupAgentIPError(IronicAPIError):
    """Error raised when automatic IP lookup fails."""

    message = 'Error finding IP for Ironic Agent'

    def __init__(self, details):
        super(LookupAgentIPError, self).__init__(details)


class ImageDownloadError(RESTError):
    """Error raised when an image cannot be downloaded."""

    message = 'Error downloading image'

    def __init__(self, image_id, msg):
        details = 'Download of image {} failed: {}'.format(image_id, msg)
        self.secondary_message = msg
        super(ImageDownloadError, self).__init__(details)


class ImageChecksumError(RESTError):
    """Error raised when an image fails to verify against its checksum."""

    message = 'Error verifying image checksum'
    details_str = ('Image failed to verify against checksum. location: {}; '
                   'image ID: {}; image checksum: {}; verification '
                   'checksum: {}')

    def __init__(self, image_id, image_location, checksum,
                 calculated_checksum):
        details = self.details_str.format(image_location, image_id, checksum,
                                          calculated_checksum)
        super(ImageChecksumError, self).__init__(details)


class ImageWriteError(RESTError):
    """Error raised when an image cannot be written to a device."""

    message = 'Error writing image to device'

    def __init__(self, device, exit_code, stdout, stderr):
        details = ('Writing image to device {} failed with exit code '
                   '{}. stdout: {}. stderr: {}')
        details = details.format(device, exit_code, stdout, stderr)
        super(ImageWriteError, self).__init__(details)


class SystemRebootError(RESTError):
    """Error raised when a system cannot reboot."""

    message = 'Error rebooting system'

    def __init__(self, exit_code, stdout, stderr):
        details = ('Reboot script failed with exit code {}. stdout: '
                   '{}. stderr: {}.')
        details = details.format(exit_code, stdout, stderr)
        super(SystemRebootError, self).__init__(details)


class BlockDeviceEraseError(RESTError):
    """Error raised when an error occurs erasing a block device."""

    message = 'Error erasing block device'

    def __init__(self, details):
        super(BlockDeviceEraseError, self).__init__(details)


class BlockDeviceError(RESTError):
    """Error raised when a block devices causes an unknown error."""

    message = 'Block device caused unknown error'

    def __init__(self, details):
        super(BlockDeviceError, self).__init__(details)


class SoftwareRAIDError(RESTError):
    """Error raised when a Software RAID causes an error."""

    message = 'Software RAID caused unknown error'

    def __init__(self, details):
        super(SoftwareRAIDError, self).__init__(details)


class VirtualMediaBootError(RESTError):
    """Error raised when virtual media device cannot be found for config."""

    message = 'Configuring agent from virtual media failed'

    def __init__(self, details):
        super(VirtualMediaBootError, self).__init__(details)


class ExtensionError(RESTError):
    pass


class UnknownNodeError(RESTError):
    """Error raised when the agent is not associated with an Ironic node."""

    message = 'Agent is not associated with an Ironic node'

    def __init__(self, details=None):
        super(UnknownNodeError, self).__init__(details)


class HardwareManagerNotFound(RESTError):
    """Error raised when no valid HardwareManager can be found."""

    message = 'No valid HardwareManager found'

    def __init__(self, details=None):
        super(HardwareManagerNotFound, self).__init__(details)


class HardwareManagerMethodNotFound(RESTError):
    """Error raised when all HardwareManagers fail to handle a method."""

    message = 'No HardwareManager found to handle method'

    def __init__(self, method):
        details = 'Could not find method: {}'.format(method)
        super(HardwareManagerMethodNotFound, self).__init__(details)


class IncompatibleHardwareMethodError(RESTError):
    """Error raised when HardwareManager method incompatible with hardware."""

    message = 'HardwareManager method is not compatible with hardware'

    def __init__(self, details=None):
        super(IncompatibleHardwareMethodError, self).__init__(details)


class VersionMismatch(RESTError):
    """Error raised when Ironic and the Agent have different versions.

    If the agent version has changed since get_clean_steps or get_deploy_steps
    was called by the Ironic conductor, it indicates the agent has been updated
    (either on purpose, or a new agent was deployed and the node was rebooted).
    Since we cannot know if the upgraded IPA will work with cleaning/deploy as
    it stands (steps could have different priorities, either in IPA or in
    other Ironic interfaces), we should restart the process from the start.

    """
    message = (
        'Hardware managers version mismatch, reload agent with correct version'
    )

    def __init__(self, agent_version, node_version):
        self.status_code = 409
        details = ('Current versions: {}, versions used by ironic: {}'
                   .format(agent_version, node_version))
        super(VersionMismatch, self).__init__(details)


class CleaningError(RESTError):
    """Error raised when a cleaning step fails."""

    message = 'Clean step failed'

    def __init__(self, details=None):
        super(CleaningError, self).__init__(details)


class DeploymentError(RESTError):
    """Error raised when a deploy step fails."""

    message = 'Deploy step failed'

    def __init__(self, details=None):
        super(DeploymentError, self).__init__(details)


class ISCSIError(RESTError):
    """Error raised when an image cannot be written to a device."""

    message = 'Error starting iSCSI target'

    def __init__(self, error_msg):
        details = 'Error starting iSCSI target: {}'.format(error_msg)
        super(ISCSIError, self).__init__(details)


class IncompatibleNumaFormatError(RESTError):
    """Error raised when unexpected format data in NUMA node."""

    message = 'Error in NUMA node data format'


class ISCSICommandError(ISCSIError):
    """Error executing TGT command."""

    def __init__(self, error_msg, exit_code, stdout, stderr):
        details = ('{}. Failed with exit code {}. stdout: {}. stderr: {}')
        details = details.format(error_msg, exit_code, stdout, stderr)
        super(ISCSICommandError, self).__init__(details)


class DeviceNotFound(NotFound):
    """Error raised when the device to deploy the image onto is not found."""

    message = ('Error finding the disk or partition device to deploy '
               'the image onto')

    def __init__(self, details):
        super(DeviceNotFound, self).__init__(details)


# This is not something we return to a user, so we don't inherit it from
# RESTError.
class InspectionError(Exception):
    """Failure during inspection."""


class ClockSyncError(RESTError):
    """Error raised when attempting to sync the system clock."""

    message = 'Error syncing system clock'


class HeartbeatConnectionError(IronicAPIError):
    """Transitory connection failure occured attempting to contact the API."""

    message = ("Error attempting to heartbeat - Possible transitory network "
               "failure or blocking port may be present.")

    def __init__(self, details):
        super(HeartbeatConnectionError, self).__init__(details)
